Method validateAst

src/org/apache/pig/parser/QueryParserDriver.java:255–264

(Tree ast)

    }

    private static Tree validateAst(Tree ast) throws RecognitionException, ParserException {
        CommonTreeNodeStream nodes = new CommonTreeNodeStream( ast );
        AstValidator walker = new AstValidator( nodes );
        AstValidator.query_return newResult = walker.query();
        Tree newAst = (Tree)newResult.getTree();

        checkError( walker );

        return newAst;
    }

    Tree expandMacro(Tree ast) throws ParserException {
        LOG.debug("Original macro AST:\n" + ast.toStringTree() + "\n");